The APOLLO CPU in SILVER3 release contains some new intructions indeed.
They have been tested with success in the MPEG RiVA to save some FPS. Goal is to prove their usefullness and play MPEG videos in 640×480 @ 24fps. Work in progress. Of course, these new instructions can be used in other sort of applications, particularly in greedy routines.

Next step for SILVER4, change resolution 320/640/800/1024/1280/1920 and some others 16/10.

Clock-cycle register

It is a new read-only register, $DE0008.
We can read it (example: tst.l $DE0008), which reset its counter.
Then, we can read it again (example: move.l $DE0008,d0) so that d0 contains number of CPU cycles since last call.
This a unique feature, very handy to analyse code and hire for greedy routines and helps to optimize code and understand how APOLLO works.